/* ============================================================
   tCam 贴贴相机 · aizst.com/tcam
   品牌色值唯一来源：tCam/DesignSystem/ColorTokens.swift
   （Japanese stationery palette，禁止另造色值）
   ============================================================ */

:root {
  /* 色板 —— 与 ColorTokens.swift 一一对应 */
  --tcam-night: #24222D;          /* sumiInk：夜空底 / 墨色文字 */
  --tcam-bg: #F5F4FA;             /* cloudPaper：米白页面底 */
  --tcam-surface: #FFFDF7;        /* stickerPaper：贴纸纸面 */
  --tcam-primary: #5F6F9F;        /* cameraIndigo：链接 / 导航 */
  --tcam-accent: #AAA7E6;         /* filmLavender：贴纸动作紫 */
  --tcam-highlight: #FFC83D;      /* yuzuShutter：快门黄 */
  --tcam-text: #24222D;           /* sumiInk */
  --tcam-text-secondary: #625B57; /* cutlineGray */
  --tcam-border: rgba(98, 91, 87, 0.16);

  /* 深色区派生（同一色板上的透明度变化，非新色值） */
  --tcam-night-text: #FFFDF7;
  --tcam-night-text-secondary: rgba(255, 253, 247, 0.62);
  --tcam-night-border: rgba(255, 253, 247, 0.16);

  --tcam-font-rounded: ui-rounded, "SF Pro Rounded", -apple-system,
    BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, sans-serif;
  --tcam-font-body: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --tcam-wrap: 1180px;
  --tcam-prose: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--tcam-surface);
  color: var(--tcam-text);
  font-family: var(--tcam-font-body);
  font-size: 17px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

img, svg { max-width: 100%; height: auto; }

a {
  color: var(--tcam-primary);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }

/* 中文排版：避免孤行短尾 */
.nb { white-space: nowrap; }
.section-lede, .hero-lede, .hero-note,
.faq-a, .flow-step .step-desc,
.policy p, .policy li { text-wrap: pretty; }

/* 纸张颗粒：静态 SVG 噪点，极轻 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 页面载入淡入（200–350ms） ---------- */
@keyframes tcam-fade {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}
.fade-in { animation: tcam-fade 320ms ease-out both; }
.fade-in-late { animation: tcam-fade 320ms ease-out 90ms both; }

/* ---------- 顶部导航 ---------- */
.site-nav {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--tcam-wrap);
  margin: 0 auto;
  padding: 18px 24px;
}
.site-nav .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--tcam-night-text);
}
.site-nav .brand:hover { text-decoration: none; }
.site-nav .brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.28);
}
.site-nav .links { display: flex; align-items: center; gap: 4px; }
.site-nav .links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 10px;
  font-size: 0.95rem;
  color: var(--tcam-night-text-secondary);
  transition: color 160ms ease, background-color 160ms ease;
}
.site-nav .links a:hover {
  color: var(--tcam-night-text);
  background: rgba(255, 253, 247, 0.07);
  text-decoration: none;
}
.site-nav .links a[aria-current="page"] { color: var(--tcam-highlight); }

/* ---------- 深色 Hero（夜空绘本层） ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(ellipse 95% 70% at 50% 118%, rgba(36, 34, 45, 0.55), transparent 62%),
    linear-gradient(168deg, rgba(95, 111, 159, 0.2), rgba(95, 111, 159, 0.1) 52%, rgba(95, 111, 159, 0.06)),
    var(--tcam-night);
  color: var(--tcam-night-text);
  overflow: clip;
}
/* 夜空蜡笔颗粒：比全局略明显，仅 Hero 范围 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.09;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
/* 克制的暖黄高光：一轮月亮式的柔光，不铺满 */
.hero::after {
  content: "";
  position: absolute;
  top: -9%;
  right: -5%;
  width: min(34vw, 380px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle,
    rgba(255, 200, 61, 0.12) 0%,
    rgba(255, 200, 61, 0.045) 40%,
    transparent 62%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--tcam-wrap);
  margin: 0 auto;
  padding: 132px 24px 96px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px;
  align-items: center;
  min-height: min(88vh, 860px);
}
.hero-eyebrow {
  font-family: var(--tcam-font-rounded);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--tcam-highlight);
  margin: 0 0 10px;
}
.hero-title {
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: clamp(2rem, 4.6vw, 3.1rem);
  line-height: 1.28;
  letter-spacing: 0.01em;
  margin: 0 0 22px;
  text-wrap: balance;
}
.hero-lede {
  font-size: 1.06rem;
  line-height: 2;
  color: var(--tcam-night-text-secondary);
  max-width: 34em;
  margin: 0 0 14px;
}
.hero-note {
  font-size: 0.95rem;
  color: var(--tcam-night-text-secondary);
  opacity: 0.85;
  max-width: 32em;
  margin: 0;
}
.hero-art {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  width: min(100%, 440px);
  justify-self: center;
}
.hero-art svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero-art .mascot {
  position: relative;
  z-index: 1;
  width: min(76%, 320px);
}

/*  compact Hero（Support / Privacy 用） */
.hero-compact .hero-inner {
  grid-template-columns: 1fr;
  min-height: 0;
  padding: 128px 24px 48px;
  gap: 0;
}
.hero-compact .hero-title { margin-bottom: 14px; }
.hero-compact .hero-lede { margin-bottom: 0; }
.hero-compact .hero-art { display: none; }
.hero-compact .meta {
  margin-top: 18px;
  font-size: 0.92rem;
  color: var(--tcam-night-text-secondary);
}

/* ---------- 正文（米白阅读层） ---------- */
.section {
  position: relative;
  background: var(--tcam-surface);
  padding: 56px 24px 72px;
}
/* 撕纸 / 波浪分隔：以单层背景绘入 section 顶部，
   与阅读层同色无缝衔接，深色夜空自然透出 */
.section::before {
  content: "";
  position: absolute;
  top: -55px;
  left: 0;
  right: 0;
  height: 56px;
  pointer-events: none;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 56' preserveAspectRatio='none'%3E%3Cpath d='M0 56 L0 40 C 420 4 1020 12 1440 32 L1440 56 Z' fill='%23FFFDF7'/%3E%3C/svg%3E") no-repeat top / 100% 100%;
}
.section-inner { max-width: var(--tcam-wrap); margin: 0 auto; }
.prose { max-width: var(--tcam-prose); margin: 0 auto; }

.section-title {
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: clamp(1.45rem, 2.6vw, 1.9rem);
  line-height: 1.4;
  margin: 0 0 20px;
  text-wrap: balance;
}
.section-lede {
  color: var(--tcam-text-secondary);
  margin: 0 0 40px;
  max-width: 34em;
}

/* 纸面卡片 */
.paper-card {
  background: var(--tcam-bg);
  border: 1px solid var(--tcam-border);
  border-radius: 22px;
  padding: 40px 44px;
  box-shadow: 0 10px 34px rgba(36, 34, 45, 0.06);
}

/* 流程：做贴纸 → 放进镜头 → 拍下来 */
.flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 44px;
}
.flow-step {
  background: var(--tcam-bg);
  border: 1px solid var(--tcam-border);
  border-radius: 20px;
  padding: 28px 24px 24px;
  text-align: center;
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.flow-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(36, 34, 45, 0.08);
}
.flow-step svg { width: 72px; margin-bottom: 14px; }
.flow-step .step-label {
  font-family: var(--tcam-font-rounded);
  font-weight: 600;
  font-size: 1.04rem;
  margin: 0 0 6px;
}
.flow-step .step-desc {
  font-size: 0.92rem;
  color: var(--tcam-text-secondary);
  margin: 0;
  line-height: 1.75;
}

/* ---------- 支持页 FAQ ---------- */
.faq-item { padding: 30px 0; border-bottom: 1px solid var(--tcam-border); }
.faq-item:first-of-type { padding-top: 6px; }
.faq-item:last-of-type { border-bottom: 0; padding-bottom: 6px; }
.faq-q {
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: 1.14rem;
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.faq-q .faq-tag {
  flex: none;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--tcam-text);
  background: var(--tcam-accent);
  border-radius: 999px;
  padding: 3px 10px 2px;
  transform: translateY(-2px);
}
.faq-q .faq-tag.tag-yellow { background: var(--tcam-highlight); }
.faq-a { margin: 0; color: var(--tcam-text-secondary); }
.faq-a strong { color: var(--tcam-text); font-weight: 600; }

.contact-box {
  margin-top: 34px;
  background: var(--tcam-night);
  color: var(--tcam-night-text);
  border-radius: 20px;
  padding: 34px 38px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.contact-box .contact-title {
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 0 4px;
}
.contact-box .contact-desc {
  margin: 0;
  font-size: 0.94rem;
  color: var(--tcam-night-text-secondary);
}
.contact-box a.contact-mail {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  background: var(--tcam-highlight);
  color: var(--tcam-night);
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: 1rem;
  transition: transform 160ms ease;
}
.contact-box a.contact-mail:hover { transform: translateY(-2px); text-decoration: none; }

/* ---------- 隐私政策正文 ---------- */
.policy h2 {
  font-family: var(--tcam-font-rounded);
  font-weight: 700;
  font-size: 1.22rem;
  margin: 40px 0 12px;
  padding-top: 8px;
}
.policy h2:first-child { margin-top: 0; }
.policy p { margin: 0 0 16px; }
.policy ul { margin: 0 0 16px; padding-left: 1.4em; }
.policy li { margin-bottom: 10px; }
.policy li::marker { color: var(--tcam-primary); }
.policy strong { font-weight: 600; }
.policy .policy-date {
  font-size: 0.92rem;
  color: var(--tcam-text-secondary);
  margin-bottom: 28px;
}

/* ---------- 页脚（深色收尾） ---------- */
.site-footer {
  background: var(--tcam-night);
  color: var(--tcam-night-text-secondary);
  padding: 44px 24px 52px;
}
.site-footer .footer-inner {
  max-width: var(--tcam-wrap);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 28px;
}
.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--tcam-font-rounded);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--tcam-night-text);
}
.site-footer nav { display: flex; gap: 4px; }
.site-footer nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 0.93rem;
  color: var(--tcam-night-text-secondary);
}
.site-footer nav a:hover { color: var(--tcam-night-text); text-decoration: none; }
.site-footer .copyright { font-size: 0.88rem; }

/* ---------- 轻动效 ---------- */
@keyframes tcam-breathe {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}
.star-breathe { animation: tcam-breathe 3.6s ease-in-out infinite; }
.star-breathe.delay { animation-delay: 1.7s; }

@keyframes tcam-float {
  0%, 100% { transform: translateY(0) rotate(-7deg); }
  50% { transform: translateY(-6px) rotate(-7deg); }
}
.sticker-float { animation: tcam-float 4.4s ease-in-out infinite; transform-origin: center; }

@keyframes tcam-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.mascot-bob { animation: tcam-bob 4.6s ease-in-out infinite; }

.contact-mascot { width: 84px; flex: none; }
.contact-box > div { flex: 1 1 220px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 104px 24px 56px;
    min-height: 0;
    text-align: left;
  }
  .hero-title { margin-bottom: 16px; }
  .hero-art { width: min(100%, 300px); }
  .flow { grid-template-columns: 1fr; gap: 14px; }
  .flow-step { display: flex; align-items: center; text-align: left; gap: 18px; padding: 20px 22px; }
  .flow-step svg { width: 56px; margin-bottom: 0; flex: none; }
  .paper-card { padding: 30px 24px; }
  .contact-box { padding: 28px 24px; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .site-nav { padding: 14px 16px; }
  .site-nav .links a { padding: 0 10px; font-size: 0.9rem; }
  .hero-inner, .hero-compact .hero-inner { padding-left: 20px; padding-right: 20px; }
  .section { padding: 56px 20px; }
  .site-footer .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in, .fade-in-late,
  .star-breathe, .sticker-float, .mascot-bob { animation: none; }
  .flow-step, .contact-box a.contact-mail, .site-nav .links a { transition: none; }
}